Pioneer PD-65 Schem & Mods

[richardau]

Hi there,

does anyone have the schematic for a Pioneer PD-65 (1994)?

I need to get specs for the transformers so I can convert the unit from 110V to 240V. There is an off-chance this may be a lost cause as they may be non-standard but I'm willing to try.

Does anyone have recommendations on modifications while the iron is hot?

Many thanks,

Richard

[jean-paul]

Hello Richard, is the Pioneers transformer a Bando PTT1110 ? If it is a Bando PTT1109 it is a 120 V only transformer...

[richardau]

Hi Jean-Paul,

thanks for the info. I haven't had a chance to open the box again to check the part number.

I think you are right though as there were no other taps/leads on the primary side.

There are actually two transformers as this was a special player with power supplies built into each of the transport and DAC boards. I was hoping the transformers were some standard and I would find a replacement for them with equivalent voltage taps on the secondary side.

I guess not.

Thanks again,

Richard.

[jean-paul]

Check which Bando is in it, I have a spare Bando PTT1110 with 230/240 V windings. That could halve your problem

[richardau]

JP,

I finally had a chance to open the case. My wife and I have a 7mth old son and he takes a lot of time. I can only do these things when he is asleep.

Anyway the transformers are indeed Bandos but they are as follows:

Transport - PTT1206
DAC - PTT1166

I took pics if you want to see inside.

I'll try and find these on the web now. You've given me the inspiration!!

Thanks man,

Richard.

[richardau]

Hey Jean-Paul,

do you have a website for a supplier of the Bando transformers?

I've tried Google, Yahoo and MSN but have been unsuccessful in finding these.


Many thanks,

Richard.

[Ruach]

Hi richardau,

Are you looking for the tranny? I think I can help you source for the 230/240V from the Pioneer service in Singapore.

I believe that they should have spare transformers for the PD-65.

Let me know.

[georgehifi]

This may help, it's from a PD77 and PD75 similar vintage to your PD65.

Cheers George

[richardau]

George,

thanks for the circuit diagram. Unfortunately this is not the same as the PD-65. Mine is a US model. I bought it in Palo Alto. The equivalent global model is a PD-95 according to the manual. The US model has two transformers each with primary windings for 110V only presumably so as to pass FCC UL regs.

Thanks again.

Richard.

[wa2ise]

Another approach is to use a small autotransformer, 230V/115V. Connect the two power transformers in series, and the centertap of the autotransformer connects to the series connection. The autotransformer connects to the mains. The autotransformer handles the difference current between one of the transformers demands more current than the other. The autotransformer can be a small one. It could be a filament transformer or such that has a pair pf primary windings 115/230.

One important thing to worry about is will the 115V transformers handle 50Hz? For the same voltage lower line frequencies require larger cores. A test to run would be to operate the equipment on an external voltage converter transformer, and see if the internal power transformers get hot. If they stay cool, you'd be fine, good to go.